[llvm-pdbdump] Re-write the record layout code to be more resilient.

This reworks the way virtual bases are handled, and also the way
padding is detected across multiple levels of aggregates, producing
a much more accurate result.

llvm-svn: 301203

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/tools/llvm-pdbdump/PrettyVariableDumper.cpp b/llvm/tools/llvm-pdbdump/PrettyVariableDumper.cpp
index 76a0d23bf87..70925f4b03d 100644
--- a/llvm/tools/llvm-pdbdump/PrettyVariableDumper.cpp
+++ b/llvm/tools/llvm-pdbdump/PrettyVariableDumper.cpp
@@ -91,6 +91,14 @@ void VariableDumper::start(const PDBSymbolData &Var, uint32_t Offset) {
   }
 }
 
+void VariableDumper::startVbptr(uint32_t Offset, uint32_t Size) {
+  Printer.NewLine();
+  Printer << "vbptr ";
+
+  WithColor(Printer, PDB_ColorItem::Offset).get()
+      << "+" << format_hex(Offset, 4) << " [sizeof=" << Size << "] ";
+}
+
 void VariableDumper::start(const PDBSymbolTypeVTable &Var, uint32_t Offset) {
   Printer.NewLine();
   Printer << "vfptr ";